you can try
mpirun --mca btl_base_verbose 100 ...
or you can simply blacklist the btl you do *not* want to use, for example
mpirun --mca btl ^sm
if you want to use vader
you can run
ompi_info --all | grep vader
to check the btl parameters,
of course, reading the source code is the best way to understand what
the vader btl can do and how
Cheers,
Gilles
On 9/1/2015 1:28 PM, Saliya Ekanayake wrote:
Thank you Gilles. Is there some documentation on vader btl and how I
can check which (sm or vader) is being used?
On Tue, Sep 1, 2015 at 12:18 AM, Gilles Gouaillardet
<gil...@rist.or.jp <mailto:gil...@rist.or.jp>> wrote:
Saliya,
OpenMPI uses btl for point to point communication, and
automatically selects the best one per pair.
Typically, the openib or tcp btl is used for inter node
communication, and the sm or vader btl for
intra node.
note the vader btl uses the knem kernel module when available for
even more optimized configurations.
Cheers,
Gilles
On 9/1/2015 5:59 AM, Saliya Ekanayake wrote:
Hi,
Just trying to see if there are any optimizations (or options) in
OpenMPI to improve communication between intra node processes.
For example do they use something like shared memory?
Thank you,
Saliya
--
Saliya Ekanayake
Ph.D. Candidate | Research Assistant
School of Informatics and Computing | Digital Science Center
Indiana University, Bloomington
Cell 812-391-4914 <tel:812-391-4914>
http://saliya.org
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--
Saliya Ekanayake
Ph.D. Candidate | Research Assistant
School of Informatics and Computing | Digital Science Center
Indiana University, Bloomington
Cell 812-391-4914
http://saliya.org
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